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Abstract
A new S2 control chart is presented for monitoring the process variance by utilizing a repetitive sampling scheme. The double control limits called inner and outer control limits are proposed, whose coefficients are determined by considering the average run length (ARL) and the average sample number when the process is in control. The proposed control chart is compared with the existing Shewhart S2 control chart in terms of the ARLs. The result shows that the proposed control chart is more efficient than the existing control chart in detecting the process shift.
Acknowledgements
The authors are deeply thankful to the editor, two reviewers for their valuable suggestions to improve the quality of this manuscript. The author, Muhammad Aslam, therefore, acknowledges with thanks DSR for the technical support.
Disclosure statement
No potential conflict of interest was reported by the authors.
Funding
This article was funded by the Deanship of Scientific Research (DSR), King Abdulaziz University, Jeddah.